l3­ex­per­i­men­tal – Ex­per­i­men­tal LaTeX3 con­cepts

The l3­ex­per­i­men­tal pack­ages are a col­lec­tion of ex­per­i­men­tal
im­ple­men­ta­tions for as­pects of the LaTeX3 ker­nel, deal­ing with
higher-level ideas such as the De­signer In­ter­face. Some of them
work as stand alone pack­ages, pro­vid­ing new func­tion­al­ity, and can
be used on top of LaTeX2ε with no changes to the ex­ist­ing ker­nel.